Members of a hip-hop dance crew who found fame on New Zealand's Got Talent are among the confirmed cases in a measles outbreak across the North Island.

Ten people contracted the infectious disease after a hip-hop event in Sydney. Nine are from Taupo and Turangi. The other confirmed case is in Auckland.

Those infected range in age from five to 28. They have been isolated, but no-one has been admitted to hospital.

Members of Turangi's Original Kids Krew are among those affected, but a spokesperson yesterday declined to comment.

The outbreak follows the World Supremacy Battlegrounds international hip-hop street dance competition in early December.

Four of the 10 confirmed cases attended and the rest are people who came into contact with them.

Public health officials have warned people who attended the event, or have been around someone who did, to look out for measles symptoms.

Bay of Plenty and Lakes District medical officer Neil de Wet said such people should call a doctor and be careful not to affect other people in the waiting room.

"The main thing is to prevent the spread," he said.

"From a public health perspective this is a very infectious illness and although the vast majority of people will make a full recovery, about 30 per cent get complications including things like pneumonia, ear infections and diarrhoea."

In New South Wales, health authorities confirmed three measles cases following the hip-hop event, and issued a public warning on Tuesday.

Public health staff in New Zealand are interviewing people who attended the event, checking whether they were immunised or infected.

Ministry of Health acting deputy director of public health Harriette Carr said the outbreak was significant, but not yet an epidemic.

Anyone with symptoms should contact the Healthline 0800 number or ring their doctor so their symptoms can be initially assessed without risk of infecting others in a waiting room or hospital emergency department, she said.